I had many cons vs pro for this switch. It was something that I was contemplating doing for years. I even tried out the original A7, and then the A7II. Both with the kit lens. But I always returned them.
But it was the A7III that tipped me over with its specs. Fullframe, IBIS, amazing low light, no 'worms' artifacts which haunted a lot of my Fuji files, incredible autofocus and battery performance that outperformes any mirrorless camera. The new battery performance reminds me of when I had DSLRs. And the new Fuji lenses are almost as huge and pricey as their Sony counterparts so I figured that if me next step is to invest in those lenses, why not just jump ship?
My next step is to save up for the 55mm 1.8 (I need something light) and the LAOWA 15mm F2. I think those two lenses paired with the 24-105 will satify my needs.
It's not that it is all a regret, but also a realization that it will take a lot of money and time to get those fantastic glasses.
I wonder if OP ever made the switch? Only now I realize that OP asked this question several month ago. 🙄
I got a lot of thoughts about the switch and the differences between the cameras.
If anyone is interested I might make a post about it.
Just DM me a question if you have any.